Keith Kelleher is president of Service Employees International Union's Healthcare Illinois. He says about 70 percent of the roughly 26,000 home health care workers are dues-paying members. The others aren't members who've had to pay "fair share fees."

However, the High Court ruled Monday that public sector unions can't collect fees from home health care workers who object to being affiliated with a union.

Kelleher didn't immediately know how much the union will lose, but estimates it could be in the millions.

He says they'll reach out to home health care workers in the private sector to help make up revenue.